Automatic hydraulic transmission



c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION April 16, 19,63

28 Sheets-Sheet l Filed 00'0. 15, 1960 April 16, 1963 c. B. HATFlELD ETAL l3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed 001;. l5, 1960 28 Sheets-Sheet 2 IIII'I'I'UTIIM.4

April 16, 1963 c. B. HATFIELD ETAL. 3,085,391

AUTOMATIC HYDRAULIC TRANsMIssIoN 28 Sheets-Sheet 3 Filed Oct. 13, 1960 April 16, 1963 c. B. HATFIELD ETAL 3,035,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed oct. 15, 1960 2s sheets-sheet 4 18A- ff 2 zaal was V /0 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed Oct. 15, 1960 28 Sheets-Sheet 5 April 16, 1963 C. B. HATFn-:LD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed 0G13. 15, 1960 28 Sheets-Sheet 6 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed oct. 1s, 19Go 2s sheets-sheet 'I April 16, 1963 c. B. HAI-FIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 8 Filed oct. 13; 1960 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 9 Filed Oct. 13, 1960 April 16, 1963 c. B. HAI-FIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet lO Filed 001'.. 13, 1960 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed Oct. 15, 1960 28 Sheets-Sheet 11 April 16, 1963 c. B. HATFlELD ETAL. 3,085,391

v AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 12 Filed Oct. 15, 1960 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed oct. 1s, 1960 28 sheetssneet 1s April 16, 1963 C. B. HATFIELD Em. 3,035,391

AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 14 Filed Oct. 13, 1960 April 16, 1963 c. B. HATFIELD ETAL 3,685,391

AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 15 Filed Oct. 15, 1960 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed oct. 1s, 1960 28 sheets-sheet 1e April 16, 1963 c. B. HATFIELD E1-AL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 17 Filed Oct. 15, 1960 l April 16, 1963 c. B. HA'rFn-:LD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed 0G13. 13, 1960 28 Sheets-Sheet 18 April 16, 1963 Filed Oct. l5, 1960 C. B. HATFIELD ETAL AUTOMATIC HYDRAULIC TRANSMISSION 28 Sheets-Sheet 19 April 16, 1963 c. B. HATFIELD ETAL 3,085,391

AUTOMATIC HYDRAULIC TRANSMISSION Filed Oct. 15, 1960 28 Sheets-Sheet 2O 

1. IN A HYDRAULIC POWER TRANSMISSION FOR USE IN INTERCONNECTING A ROTATIONAL SOURCE OF POWER INCLUDING AN INTERNAL COMBUSTION ENGINE HAVING A THROTTLE, SAID POWER SOURCE HAVING A DRIVING SHAFT, AND A ROTATIONAL LOAD HAVING A DRIVEN SHAFT, THE IMPROVEMENT COMPRISING: FIRST MEANS DISPLACING A HYDRAULIC FLUID UNDER PRESSURE DRIVEN BY SAID DRIVING SHAFT, SECOND MEANS POSITIVELY DISPLACING SAID FLUID AND CONNECTED TO SAID DRIVEN SHAFT, THIRD MEANS SENSITIVE TO INCREMENTAL CHANGES IN TRANSMITTED TORQUE TO SAID LOAD BY SAID SECOND MEANS FOR VARYING THE EFFECTIVE DISPLACEMENT OF SAID SECOND MEANS, FOURTH MEANS SENSITIVE TO THE ROTATIONAL SPEED OF SAID POWER SOURCE, AND FIFTH MEANS SENSITIVE TO THE THROTTLE ADJUSTMENT OF SAID ENGINE, SAID THIRD, FOURTH AND FIFTH MEANS INDEPENDENTLY VARYING THE EFFECTIVE DISPLACEMENT OF SAID SECOND MEANS. 